Doonesbury by Garry Trudeau for July 11, 1997
Transcript:
Zonker: Boopsie, if the nearest star is a gazillion light-years away. How would an alien survive the trip to earth? Boopsie: Cryogenics. They freeze themselves. Zonker: But who would volunteer for such a mission? By the time he got home, his whole species might have been extinct for eons! Boopsie: Hmm...that's right... Zonker: Maybe they only sent their bad elements - alien scum. Boopsie: Well, of course! Earth is like their Australia!
Alien scum are perfect little gentlemen?